<template>
  <!-- 分类页面 -->
  <view>
    <!-- 使用自定义的搜索组件 -->
    <!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
     <my-search @click="gotoSearch"></my-search>
    
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh + 'px'}">
       <block v-for="(item,i) in cateList" :key="i">
         <view :class="['left-scroll-view-item',i === active ? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
       </block>
      </scroll-view>
      
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题 -->
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 当前二级分类下的三级分类的列表 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的item项 -->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon" mode=""></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view> 
      </scroll-view>
    </view>
  </view>
</template>

<script>

 import badgeMix from '@/mixins/tabbar-badge.js'
 
 export default {
   mixins:[badgeMix],
    data() {
      return {
        // 当前设备可用的高度
        wh:0,
        // 获取分类数据列表
        cateList:[],
        // 默认激活项
        active:0,
        // 二级分类的列表
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad() {
    const sysInfo =  uni.getSystemInfoSync()
    // console.log(sysInfo)
    this.wh = sysInfo.windowHeight - 50
    
     // 调用获取分类列表数据的方法
    this.getCateList()
    },
    methods: {
      // 获取分类列表的数据
     async getCateList() {
      const {data:res} = await uni.$http.get('/api/public/v1/categories')
      if (res.meta.status!==200) return uni.$showMsg()
      this.cateList = res.message
      
      // 为二级分类赋值
     this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      
      // 跳转到商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      
      gotoSearch() {
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  
  .left-scroll-view {
    width: 120px;
    
    .left-scroll-view-item {
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active {
        background-color: #ffffff;
        position: relative;
        
        &::before {
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}

.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}

.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  
  .cate-lv3-item {
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    
    image {
      width: 60px;
      height: 60px;
    }
    text {
      font-size: 12px;
    }
  }
}
</style>
